4 files changed, 14 insertions, 8 deletions
diff --git a/src/syntax/expr.rs b/src/syntax/expr.rs
index 368fe41f..21df47c8 100644
--- a/src/syntax/expr.rs
+++ b/src/syntax/expr.rs
@@ -28,7 +28,7 @@ pub enum Expr {
     /// A fraction unit literal: `1fr`.
     Fractional(Span, f64),
     /// A string literal: `"hello!"`.
-    Str(Span, String),
+    Str(Span, EcoString),
     /// An identifier: `left`.
     Ident(Ident),
     /// An array expression: `(1, "hi", 12cm)`.
diff --git a/src/syntax/ident.rs b/src/syntax/ident.rs
index a46ad232..b1328bbe 100644
--- a/src/syntax/ident.rs
+++ b/src/syntax/ident.rs
@@ -3,6 +3,7 @@ use std::ops::Deref;
 use unicode_xid::UnicodeXID;
 
 use super::Span;
+use crate::eco::EcoString;
 
 /// An unicode identifier with a few extra permissible characters.
 ///
@@ -16,7 +17,7 @@ pub struct Ident {
     /// The source code location.
     pub span: Span,
     /// The identifier string.
-    pub string: String,
+    pub string: EcoString,
 }
 
 impl Ident {
@@ -26,7 +27,10 @@ impl Ident {
         span: impl Into<Span>,
     ) -> Option<Self> {
         if is_ident(string.as_ref()) {
-            Some(Self { span: span.into(), string: string.into() })
+            Some(Self {
+                span: span.into(),
+                string: EcoString::from_str(string),
+            })
         } else {
             None
         }
@@ -34,13 +38,13 @@ impl Ident {
 
     /// Return a reference to the underlying string.
     pub fn as_str(&self) -> &str {
-        self.string.as_str()
+        self
     }
 }
 
 impl AsRef<str> for Ident {
     fn as_ref(&self) -> &str {
-        self.as_str()
+        self
     }
 }
 
@@ -48,7 +52,7 @@ impl Deref for Ident {
     type Target = str;
 
     fn deref(&self) -> &Self::Target {
-        self.as_str()
+        self.string.as_str()
     }
 }
 
diff --git a/src/syntax/mod.rs b/src/syntax/mod.rs
index 6673fda6..1de5c1dd 100644
--- a/src/syntax/mod.rs
+++ b/src/syntax/mod.rs
@@ -13,6 +13,8 @@ pub use node::*;
 pub use span::*;
 pub use token::*;
 
+use crate::eco::EcoString;
+
 /// The abstract syntax tree.
 ///
 /// This type can represent a full parsed document.
diff --git a/src/syntax/node.rs b/src/syntax/node.rs
index 1fbdb3d8..bb9ff098 100644
--- a/src/syntax/node.rs
+++ b/src/syntax/node.rs
@@ -6,7 +6,7 @@ use super::*;
 #[derive(Debug, Clone, PartialEq)]
 pub enum Node {
     /// Plain text.
-    Text(String),
+    Text(EcoString),
     /// Whitespace containing less than two newlines.
     Space,
     /// A forced line break: `\`.
@@ -38,7 +38,7 @@ pub struct RawNode {
     pub lang: Option<Ident>,
     /// The raw text, determined as the raw string between the backticks trimmed
     /// according to the above rules.
-    pub text: String,
+    pub text: EcoString,
     /// Whether the element is block-level, that is, it has 3+ backticks
     /// and contains at least one newline.
     pub block: bool,